do you have header files in /usr/include/ before installing the commandline tools?
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Negative ZeroJul 31 '12 at 23:17

@NegativeZero No, it was empty or there wasn't one, I'm not sure whether I've mkdir an empty one to try to remediate and later noticed that I just needed to install the commandline tools.
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pepper_chicoAug 1 '12 at 5:15

arh, it looks like someone had the similar issue with me then.
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Negative ZeroAug 1 '12 at 5:54